Surface water supply of the United States, 1921, Part V, Hudson Bay and upper Mississippi River basins
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1971 ◽
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1936 ◽
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Surface water supply of the United States, 1951, Part V, Hudson Bay and upper Mississippi River basins
1953 ◽
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1959 ◽
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1948 ◽
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1956 ◽
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1950 ◽
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1971 ◽
1971 ◽
1951 ◽
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